CN110296546A - Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device - Google Patents
Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device Download PDFInfo
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- CN110296546A CN110296546A CN201910597539.2A CN201910597539A CN110296546A CN 110296546 A CN110296546 A CN 110296546A CN 201910597539 A CN201910597539 A CN 201910597539A CN 110296546 A CN110296546 A CN 110296546A
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- oil return
- condition
- air conditioner
- compressor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The present invention provides method for controlling oil return, oil return control device and the air conditioner of a kind of multi-gang air-conditioner device, the method for controlling oil return of the multi-gang air-conditioner device includes: indoor unit unlatching quantity in the detection air conditioner；Quantity, which is opened, based on the indoor unit judges whether the air conditioner has oil starvation risk；If so, judging whether the air conditioner meets oil return condition, and when the air conditioner meets oil return condition, oil return operation is executed.Not timing oil return can be achieved in the present invention, obtains better oil return effect.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of multi-gang air-conditioner device method for controlling oil return, return
Oily control device and air conditioner.
Background technique
Compressor is one of main component of refrigeration system, and lubricating oil is to playing lubrication in compressor between moving component
The substance of effect, it is dissolved in refrigerant and flows in inside and outside machine system pipeline with refrigerant.Lubricating oil can make respectively to transport in compressor
Oil film is formed between the rubbing surface of dynamic component, to reduce frictional force, reduce frictional heat and parts depreciation, and then improves compressor
Reliability, durability and efficiency.
If it is insufficient to will lead to flow velocity in multi-online air-conditioning system pipeline because considering compressor low-frequency operation always, it is difficult to
The refrigeration oil of system is taken back, in the prior art, usually executes special oil return after compressor low frequency runs a period of time
Operation.However, when system itself consumes few (e.g., when environment temperature is lower, air conditioner refrigerating does not need very high-frequency), institute
Need compressor frequency also low, multi-online air-conditioning system if oil return in this case may not will cause the energy not by oil starvation
Necessary consumption.
Summary of the invention
Problems solved by the invention is existing to be sentenced based on compressor frequency and runing time to oil return operation execution opportunity
Break not accurate enough.
To solve the above problems, the present invention provides a kind of method for controlling oil return of multi-gang air-conditioner device, comprising:
It detects indoor unit in the air conditioner and opens quantity；Quantity, which is opened, based on the indoor unit judges that the air conditioner is
It is no to have oil starvation risk；If so, judging whether the air conditioner meets oil return condition, and meet oil return condition in the air conditioner
When, execute oil return operation.
The judgment step controlled by setting two-stage oil return, firstly, opening whether quantity judges air conditioner based on indoor unit
There are oil starvation risks because indoors machine open quantity account for indoor unit total quantity ratio it is smaller when, will lead to more freezing
Oil is stored in the indoor unit of closing, cannot be introduced into progress oil return circulation in the oil line pipe of unlatching, and compressor output work
Rate is lower, and the flow velocity in multi-online air-conditioning system pipeline is slower, oil can not be taken back compressor in time, so, in machine indoors
Open quantity account for indoor unit total quantity ratio it is smaller when, air conditioner there are oil starvation risk, thus, quantity is opened based on indoor unit
It can primarily determine whether carry out subsequent oil starvation judgement (judging whether air conditioner meets oil return condition), it as a result, both can be
Air-conditioning carries out oil starvation judgement when having oil starvation risk in time, can also be unnecessary scarce to avoid also carrying out in no oil starvation risk
Oil judgement；Then, quantitative determination air conditioner is being opened there are after oil starvation risk based on indoor unit, is judging whether air conditioner meets back
Deep-fried twisted dough sticks part, to judge the opportunity for executing oil return operation, that is, the judgment step for the two-stage oil return control that the present invention is arranged,
Quantity can be opened based on indoor unit and screen out the time point for being not required to carry out oil return judgement, reduce useless oil starvation judgement, reduce the energy
Waste, meanwhile, the time point for carrying out oil starvation judgement will be needed to screen, the judgement on oil return operation execution opportunity is carried out, can obtain
It obtains more accurate oil return and operates execution opportunity, obtain better oil return effect.In addition, the timing oil return in compared with the prior art,
The present invention is based on air-conditioner system actual motion states (indoor unit unlatching quantity) to judge whether to oil starvation judgement, it can be achieved that not
Timing oil return more flexibly can get better oil return effect.
Optionally, described to judge whether the air conditioner has the step of oil starvation risk packet based on indoor unit unlatching quantity
It includes:
Judge that the indoor unit opens whether quantity is less than or equal to first threshold；
If it is not, then resetting existing accumulation duration, returns and execute indoor unit unlatching quantity in the detection air conditioner
The step of, wherein when the existing accumulation under a length of current time, the indoor unit opens quantity and is less than or equal to first threshold
Accumulation operation duration；
If so, continuing to add up the existing accumulation duration；
Judge whether the existing accumulation duration is greater than or equal to the first duration；
If so, determining that the air conditioner has oil starvation risk.
It avoids carrying out useless oil return execution opportunity judgement, reduces energy waste, obtain more accurate oil return and judge opportunity.
Optionally, described to judge whether the air conditioner meets oil return condition, and meet oil return condition in the air conditioner
When, executing the step of oil return operates includes:
Obtain the correspondence parameter that compressor is had turned in the air conditioner；
Based on the correspondence parameter for having turned on compressor, judge in the air conditioner with the presence or absence of satisfaction the first triggering item
Part has turned on compressor；
If so, executing oil return operation, wherein first trigger condition is first condition, second condition and third
Any one in condition,
The first condition is that delivery temperature is greater than or equal to the first temperature threshold, and discharge superheat is greater than or equal to the
Two temperature thresholds, the second condition be bottom oil temperature be greater than or equal to third temperature threshold, and the bottom oil temperature be greater than or
Equal to the delivery temperature, the third condition be delivery temperature be greater than or equal to the 4th temperature threshold, running frequency be less than or
Equal to first frequency value, and running current is greater than or equal to the first current value.
By judge in air conditioner with the presence or absence of at least one compressor meet the first trigger condition, if it exists at least one
Compressor meet the first trigger condition, then execute oil return operation, wherein the first trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, described based on the correspondence parameter for having turned on compressor, judge in the air conditioner with the presence or absence of full
The first trigger condition includes: later the step of having turned on compressor enough
If there is no meet first trigger condition to have turned on compressor in the air conditioner, opened based on described
The correspondence parameter that opens compressor judges to have turned on compressor with the presence or absence of meeting the second trigger condition in the air conditioner,
In, second trigger condition is any one in first condition, second condition and third condition, and described second triggers
Condition and first trigger condition be not identical；
If there is the second trigger condition of satisfaction in the air conditioner has turned on compressor, oil return operation is executed.
By judge in air conditioner with the presence or absence of at least one compressor meet the second trigger condition, if it exists at least one
Compressor meet the second trigger condition, then execute oil return operation, wherein the second trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, if there is no meet first trigger condition to have turned on compressor in the air conditioner,
Based on the correspondence parameter for having turned on compressor, having opened with the presence or absence of the second trigger condition of satisfaction in the air conditioner is judged
Include: after the step of opening compressor
If there is no meet second trigger condition to have turned on compressor in the air conditioner, opened based on described
The correspondence parameter for opening compressor judges to have turned on compressor with the presence or absence of meet third trigger condition in the air conditioner,
In, the third trigger condition is any one in first condition, second condition and third condition, and the third triggers
Condition is different from first trigger condition, first trigger condition；
If exist in the air conditioner meet third trigger condition have turned on compressor, execute oil return operation.
By judging to meet third trigger condition with the presence or absence of at least one compressor in air conditioner, if it exists at least one
Compressor meets third trigger condition, then execute oil return operation, wherein third trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, after the step of execution oil return operates:
What judgement met trigger condition has turned on whether compressor meets exit criteria；If so, exiting oil return operation.
By meeting when having turned on compressor and meeting exit criteria of trigger condition, oil return operation is exited, it is ensured that should
Compressor is normal through oil return operation recovery, guarantees the realization of oil return effect.
Optionally, described to judge to meet the having turned in the step of whether compressor meets exit criteria of trigger condition, institute
It states exit criteria and is determined according to the trigger condition that compressor is met is had turned on, wherein is described to have turned on what compressor was met
When trigger condition is first condition, the exit criteria is less than or equal to the 5th temperature threshold for the delivery temperature, and described
Discharge superheat is less than or equal to the 6th temperature threshold；It is described to have turned on the trigger condition that compressor is met as second condition
When, the exit criteria is the bottom oil temperature less than the 7th temperature threshold, and the bottom oil temperature is less than the delivery temperature；
Described when to have turned on trigger condition that compressor is met be third condition, the exit criteria is the delivery temperature less than the
Eight temperature thresholds, and the running frequency is greater than second frequency value, the running current is less than the second current value.
By the way that each trigger condition and each exit criteria are mapped, it can be ensured that the accuracy of entire oil return logic, it is ensured that
Oil return process is not influenced by other termination conditions, so that the compressor of oil starvation is restored to not oil starvation state, guarantees oil return effect
It realizes.
Optionally, described if so, judge whether the air conditioner meets oil return condition, and meet back in the air conditioner
When deep-fried twisted dough sticks part, execute the step of oil return operates includes: later
Count the operation duration of the oil return operation；
When detecting that the operation duration of the oil return operation is greater than or equal to the second duration, oil return operation is exited.
Limit value is set by the operation duration operated to oil return, the operation duration that can avoid oil return operation is too long, avoids
Adverse effect is caused to the normal operation of air-conditioning.
Optionally, the first threshold is the 50% of indoor unit total quantity.It can determine the appropriate oil return condition judgement of comparison
Opportunity.
Optionally, first temperature threshold is 90 DEG C~97 DEG C.
By the first temperature threshold of setting, it can be achieved that the conditioners running conditions parameter pair such as delivery temperature based on compressor
Oil starvation compressor carries out accurate judgement, and then determines that accurate oil return operates opportunity.
Optionally, the first current value I meets following formula:
I=i-k, (0.05A≤k≤0.15A)
Wherein, i is preset compressor protection current value.
By the first current value of setting, it can be achieved that being compressed based on conditioners running conditions parameters such as compressor currents to oil starvation
Machine carries out accurate judgement, and then determines that accurate oil return operates opportunity.
The present invention also proposes a kind of oil return control device, comprising:
Detection unit, the detection unit open quantity for detecting indoor unit in the air conditioner；
Judging unit, the judging unit are used to judge whether the air conditioner has based on indoor unit unlatching quantity scarce
Alopecia areata danger；
Oil return unit, the oil return unit are used for when the air conditioner meets oil return Rule of judgment, judge the air-conditioning
Whether device meets oil return condition, and when the air conditioner meets oil return condition, executes oil return operation.
The method for controlling oil return of the oil return control device and the multi-gang air-conditioner device is had compared with the existing technology
Advantage it is similar, details are not described herein.
The present invention also proposes a kind of air conditioner, computer readable storage medium and processing including being stored with computer program
Device when the computer program is read and run by the processor, realizes method as described above.
The method for controlling oil return of the air conditioner and the multi-gang air-conditioner device compared with the existing technology possessed by advantage
Similar, details are not described herein.
The present invention also proposes that a kind of computer readable storage medium, including computer-readable recording medium storage have computer
Program when the computer program is read out by the processor and runs, realizes method as described above.
The method for controlling oil return of the computer readable storage medium and the multi-gang air-conditioner device is compared with the existing technology
Possessed advantage is similar, and details are not described herein.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for controlling oil return first embodiment of multi-gang air-conditioner device of the present invention；
Fig. 2 is the flow diagram of the method for controlling oil return second embodiment of multi-gang air-conditioner device of the present invention；
Fig. 3 is the flow diagram of the method for controlling oil return 3rd embodiment of multi-gang air-conditioner device of the present invention；
Fig. 4 is the flow diagram of the method for controlling oil return fourth embodiment of multi-gang air-conditioner device of the present invention；
Fig. 5 is the flow diagram of the 5th embodiment of method for controlling oil return of multi-gang air-conditioner device of the present invention；
Fig. 6 is the structural schematic diagram of oil return control device of the present invention；
Fig. 7 is the air condition of that present invention structural schematic diagram.
Description of symbols:
101- detection unit, 102- judging unit, 103- oil return unit, 201- computer readable storage medium, at 202-
Manage device.
Specific embodiment
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail." first " " second " " third " " the 4th " " the 5th " " the 6th " is only used for referring to herein
Different objects have no superiority and inferiority difference, also without other particular meanings.
Multi-online air-conditioning system has multiple indoor units, and each indoor unit inlet tube design has expansion valve, when indoor unit not
When unlatching, corresponding expansion valve can be in close state, when the indoor unit quantity of unlatching accounts for indoor unit number that is smaller, being not turned on
(accounting herein, the ratio for referring to the total indoor unit quantity of indoor unit quantity Zhan of unlatching, the indoor unit number being not turned on when amount accounting is larger
Measure the ratio of the total indoor unit quantity of Zhan), it on the one hand will lead to more refrigeration oil and be stored in the indoor unit of closing, cannot be introduced into
Oil return circulation is carried out into the oil line pipe of unlatching, on the other hand, when the indoor unit quantity accounting of unlatching is smaller, compressor output
Power is lower, and the flow velocity in multi-online air-conditioning system pipeline is slower, and in the oil line pipe of unlatching, slower flow velocity can not be timely
Oil is taken back into compressor, oil is caused to be trapped in oil line pipe, thus, it is multi-joint when the indoor unit quantity accounting of unlatching is smaller
There are oil starvation risks for compressor in air conditioner system.
Oil return control is carried out on appropriate opportunity, is the key that guarantee that multi-online air-conditioning system operates normally.Existing time
Oil control trigger condition, usually " compressor is lower than some frequency values operation a period of time ", if when compressor frequency and operation
Between be unsatisfactory for above-mentioned common oil return control trigger condition, even if then multi-online air-conditioning system is opened with the lesser indoor unit of accounting
Quantity is run, there may be oil starvation risk, and multi-online air-conditioning system will not carry out the step of further excluding oil starvation risk
Or oil return control, the oil starvation scene for illustrating that existing oil return control trigger condition covers is very little, and the judgement on oil return opportunity is not smart enough
It is quasi-；In addition, (running air-conditioning system when such as environment temperature is lower when multi-online air-conditioning system is in the lower scene of required energy consumption
It is cold, when running air-conditioning heating when environment temperature is higher), the compressor frequency of multi-online air-conditioning system is relatively low, answers such
With under scene, even if the frequency and runing time of compressor are all satisfied above-mentioned oil return control trigger condition, multi-online air-conditioning system
Also there is no oil starvation problems will cause the unnecessary energy consumption of multi-online air-conditioning system if oil return in this case,
It will affect cooling, heating effect.
Air conditioner in present specification, i.e., the above-mentioned multi-online air-conditioning system comprising multiple indoor units.
Based on above-mentioned analysis, the present invention proposes a kind of method for controlling oil return of multi-gang air-conditioner device.
Fig. 1 is the flow diagram of the method for controlling oil return first embodiment of multi-gang air-conditioner device of the present invention.
The method for controlling oil return of the multi-gang air-conditioner device includes:
Step S10 detects indoor unit in the air conditioner and opens quantity；
After air conditioner start completion, in normal course of operation, executes computer program and realize multi-gang air-conditioner device of the present invention
Method for controlling oil return correspond to step.Detecting air conditioner start completion, such as when compressor start completion, stable operation,
Indoor unit in air conditioner can be started to detect and open quantity, and in air conditioner normal course of operation, in real time or timing detection is empty
Indoor unit in device is adjusted to open quantity.This programme is mainly used under the refrigeration mode of air conditioner.
When there is multiple indoor units, user can determine the indoor unit opened according to environment temperature and the actual demand of itself
Whether quantity, air conditioner can be started by the corresponding compressor of detection indoor unit, or directly detection indoor unit whether start it is (such as swollen
Whether swollen valve is opened or special starting marker determines the indoor unit etc. opened), then count the indoor unit quantity of unlatching.
Step S20 opens quantity based on the indoor unit and judges whether the air conditioner has oil starvation risk；
Oil return Rule of judgment, refers to and judges whether air conditioner is likely to occur oil starvation, judge in other words air conditioner whether need into
The judgement of row oil starvation.
Based on Such analysis it is found that when the indoor unit quantity accounting of unlatching is smaller, it is existing that compressor is likely to occur oil starvation
As, and when the indoor unit quantity accounting of unlatching is larger, compressor output power is also corresponding larger, stream in air conditioner oil line pipe
Speed is enough to take back oil into compressor, and most of oil in entire air conditioner have all entered in the oil circulation opened, so,
In the biggish situation of indoor unit quantity accounting of unlatching, oil starvation possibility is not high.
Therefore, before whether subsequent progress air conditioner meets the judgement of oil return condition, quantity is opened based on indoor unit and is sentenced
Whether the air conditioner that breaks meets oil return Rule of judgment, can screen out the larger situation of the indoor unit quantity accounting of unlatching, only
When the indoor unit quantity accounting of unlatching is smaller, the judgement whether subsequent air conditioner meets oil return condition is just carried out, can be reduced open
Useless judgement (because will not oil starvation) in the larger situation of indoor unit quantity accounting opened, reduces energy dissipation.
Optionally, described quantity to be opened based on the indoor unit to judge whether the air conditioner has scarce in an embodiment
Alopecia areata danger, specifically includes: machine opens quantity less than or equal to preset value and when continuing preset duration indoors, determines that air conditioner has
Oil starvation risk；Machine opens quantity greater than preset value indoors, then determines that air conditioner is unsatisfactory for oil return Rule of judgment, can return to execution
Step S10.
When air conditioner opens quantity with indoor unit and is less than or equal to the state continuous service preset duration of preset value, air-conditioning
Device is likely to occur petrol starvation, then determines that air conditioner has oil starvation risk, continue whether air conditioner meets sentencing for oil return condition
It is disconnected.Preset value is pre-stored in air conditioner by developer.
Continue preset duration, can refer in the preset duration, air conditioner does not power off, do not shut down, and indoor unit opens quantity
Never there is the case where being greater than preset value；Also it can refer in the preset duration, indoor unit is opened quantity and never occurred
The case where greater than preset value, but air conditioner may break electricity, Guan Guoji, at this time air conditioner cumulative statistics power-off front and back or shutdown before
Indoor unit opens the duration that quantity is less than or equal to the state of preset value afterwards.
Optionally, in another embodiment, described to open whether quantity judges the air conditioner based on the indoor unit
There is oil starvation risk, specifically include: when machine opens quantity less than or equal to preset value indoors, determining that air conditioner has oil starvation risk.
Quantity is opened with indoor unit in air conditioner and is less than or equal to preset value, air conditioner is likely to occur petrol starvation, then sentences
Determining air conditioner has oil starvation risk, continues the judgement whether air conditioner meets oil return condition.
Step S30 if so, judging whether the air conditioner meets oil return condition, and meets oil return in the air conditioner
When condition, oil return operation is executed.
Oil return condition refers to the condition for judging whether air conditioner needs oil return really, is transported by real-time monitoring air-conditioner system
Row state parameter judges whether air conditioner needs oil return really.If air conditioner is unsatisfactory for oil return condition, do not need to execute oil return behaviour
Make, then can return to and execute step S10, step S30 can also be executed again up to detecting that indoor unit opens quantity and be greater than preset value,
Or until detect that air conditioner meets oil return condition.
Oil return condition can be the condition being made of the value range of system running state parameter, for example, " delivery temperature
More than or equal to the first temperature, and discharge superheat is greater than or equal to second temperature ", and/or " bottom oil temperature is greater than or equal to the
Three temperature, and the bottom oil temperature is greater than or equal to the delivery temperature ", and/or " delivery temperature is greater than or equal to the 4th temperature
Degree, running frequency are less than or equal to first frequency, and running current is greater than or equal to the first electric current ".
Using air conditioner state parameter as Rule of judgment, compared with " low frequency operation preset duration ", more flexibly, accurately.
Oil return operation includes: to improve compressor operating frequency, and the indoor unit expansion valve of closing is opened, and adjusts outdoor wind
Oil is taken out of from the indoor unit of closing to promote the flow velocity in oil line pipe, takes back the oil being trapped in oil line pipe by machine
Compressor.Specifically, oil return, which operates, includes:
The running frequency for having turned on compressor is improved, compressor start will not opened, and run with certain frequency；Specifically
The compressor for having turned on compressor can be run according to 65hz, the compressor unification for not opening outdoor module is run according to 75hz；
The expansion valve opening for having turned on indoor unit is adjusted, the expansion valve for not opening indoor unit is opened, and adjusts
For certain aperture；The expansion valve for having turned on indoor unit specifically can be uniformly adjusted to 160-200 step, the swollen of indoor unit will not opened
Swollen valve is uniformly adjusted to 100-140 step；
Detection obtains outdoor high-pressure, when the outdoor high-pressure is greater than first pressure value, by each outdoor unit
Blower upshiftd with pre-set velocity, until be raised to it is most high-grade, will be each when the outdoor high-pressure is less than second pressure value
The blower of outdoor unit is downshifted with pre-set velocity, until be preferably minimized shelves, is less than or equal to described the in the outdoor high-pressure
When one pressure value, the outdoor high-pressure are greater than or equal to the second pressure value, the blower of each outdoor unit is kept
Gear it is constant；Specifically, as Pd > 30kg ± 1kg, outdoor fan is most high-grade until being raised to according to one grade of 45s liter, work as Pd
When < 26kg ± 1kg, by outdoor fan according to one grade of 45s drop until being preferably minimized shelves, as 26kg≤Pd≤30kg, outdoor wind
Machine gear remains unchanged.
The judgment step controlled by setting two-stage oil return, firstly, opening whether quantity judges air conditioner based on indoor unit
There are oil starvation risks because indoors machine open quantity account for indoor unit total quantity ratio it is smaller when, will lead to more freezing
Oil is stored in the indoor unit of closing, cannot be introduced into progress oil return circulation in the oil line pipe of unlatching, and compressor output work
Rate is lower, and the flow velocity in multi-online air-conditioning system pipeline is slower, oil can not be taken back compressor in time, so, in machine indoors
Open quantity account for indoor unit total quantity ratio it is smaller when, air conditioner there are oil starvation risk, thus, quantity is opened based on indoor unit
It can primarily determine whether carry out subsequent oil starvation judgement (judging whether air conditioner meets oil return condition), it as a result, both can be
Air-conditioning carries out oil starvation judgement when having oil starvation risk in time, can also be unnecessary scarce to avoid also carrying out in no oil starvation risk
Oil judgement；Then, quantitative determination air conditioner is being opened there are after oil starvation risk based on indoor unit, is judging whether air conditioner meets back
Deep-fried twisted dough sticks part, to judge the opportunity for executing oil return operation, that is, the judgment step for the two-stage oil return control that the present invention is arranged,
Quantity can be opened based on indoor unit and screen out the time point for being not required to carry out oil return judgement, reduce useless oil starvation judgement, reduce the energy
Waste, meanwhile, the time point for carrying out oil starvation judgement will be needed to screen, the judgement on oil return operation execution opportunity is carried out, can obtain
It obtains more accurate oil return and operates execution opportunity, obtain better oil return effect.In addition, the timing oil return in compared with the prior art,
The present invention is based on air-conditioner system actual motion states (indoor unit unlatching quantity) to judge whether to oil starvation judgement, it can be achieved that not
Timing oil return more flexibly can get better oil return effect.
Optionally, such as Fig. 2, in the method for controlling oil return second embodiment of multi-gang air-conditioner device of the present invention, the step
S20 includes:
Step S21 judges that the indoor unit opens whether quantity is less than or equal to first threshold；
First threshold designs for developer, and is pre-set in air conditioner, is executing multi-gang air-conditioner device of the present invention
Method for controlling oil return when corresponding to step, directly obtain first threshold from air conditioner memory.Optionally, the first threshold
For the 45%-60% of indoor unit total quantity, first threshold is chosen as the 50% of indoor unit total quantity, it may be determined that more appropriate returns
Deep-fried twisted dough sticks part judges opportunity, i.e. oil starvation judges opportunity.
When machine opens quantity less than or equal to first threshold indoors, compressor output power is low, flow velocity in oil line pipe
Deficiency, the oil when air conditioner has just initiated a switch to indoor unit and opened quantity less than or equal to first threshold state, in compressor
It may not enter in oil line pipe with refrigerant also, at this point, it is not necessary to whether oil return, i.e., meet oil return item also without progress is subsequent
The judgement of part, i.e., judgement be unsatisfactory for oil return Rule of judgment, air conditioner keep the state continuous service for a period of time after, compressor
Interior most oil enters in oil line pipe, and because flow velocity is insufficient, much can not all may return to pressure by oil in oil line pipe
In contracting machine, therefore, it is necessary to the duration whether indoor unit unlatching quantity is less than or equal to first threshold to be counted, with true
Fixed appropriate oil return condition judges opportunity.
Step S22 is returned if it is not, then resetting existing accumulation duration and is executed the step S10, wherein described existing tired
When product under a length of current time, the indoor unit opens the accumulation operation duration that quantity is less than or equal to first threshold；
Existing accumulation duration, referred under current time, and indoor unit opens the accumulation operation that quantity is less than or equal to first threshold
Duration can be specially under current time, and air conditioner is in indoor unit and opens quantity less than or equal in the state of first threshold, presses
The accumulation operation duration of contracting machine.
Specifically, it can refer in the existing accumulation duration, air conditioner does not power off, do not shut down, and indoor unit opens quantity one
Straight the case where being greater than first threshold without appearance；Also it can refer in the existing accumulation duration, indoor unit is opened quantity and never had
There is the case where being greater than preset value, but air conditioner may break electricity, Guan Guoji, if machine opens quantity and is less than or equal to the indoors
When one threshold value, air conditioner power-off or shutdown, then storing the duration that add up, (indoor unit opens quantity less than or equal to first threshold
Accumulation duration), be once again powered up or be switched in air conditioner, and indoor unit open quantity be less than or equal to first threshold when, in institute
On the basis of stating the duration added up, continue accumulative indoor unit and open the duration that quantity is less than or equal to first threshold, citing and
Speech, meeting the oil return Rule of judgment corresponding time is 1 hour, under current time, and air conditioner room unit opens quantity and is less than or waits
In first threshold, and added up when it is 20 minutes a length of, at this point, air conditioner power off, air conditioner is by (20 points of the duration added up
Clock) storage, then, detect air conditioner be powered, and air conditioner room unit open quantity still less than or be equal to first threshold, then
On the basis of duration (20 minutes) added up, continue timing, as long as persistently adding up 40 minutes again, that is, can determine that air conditioner has
Oil starvation risk.
If detecting that indoor unit opens quantity and is greater than first threshold, corresponding compressor horsepower is larger, in oil line pipe
Flow velocity be enough to take back oil in compressor, and in whole system most of oil all in oil circulation, so, cooler compressor
Not oil starvation (refer to whole system oil mass is sufficient in the case of not oil starvation).At this point, will be under current time, accumulative indoor unit opens number
The accumulation operation duration that amount is less than or equal to first threshold is reset, and is less than or equal to the subsequently detecting indoor unit and opening quantity
Indoor unit when one threshold value, is started/added up again opens the accumulation operation duration that quantity is less than or equal to first threshold.
In an implement scene, indoor unit unlatching quantity continues for some time (not up to full less than or equal to first threshold
The time of sufficient oil return Rule of judgment) after, indoor unit is opened quantity and is switched to greater than first threshold, then by Changqing when existing accumulation
Zero.For example, meeting the oil return Rule of judgment corresponding time is 1 hour, indoor unit is opened quantity and is held less than or equal to first threshold
It is 50 minutes continuous, it then detects indoor unit and opens quantity greater than first threshold, then a length of 50 minutes when existing accumulation, by existing accumulation
Duration is reset, at this point, indoor unit, which opens quantity, is greater than first threshold, operational effect, which is equivalent to, executes the effect that oil return operation reaches
Fruit, hereafter, when being just switched to again greater than first threshold less than or equal to first threshold from indoor unit unlatching quantity, air conditioner is whole
A oil circuit state is equivalent to the state after oil return operation, should start from scratch and count existing accumulation duration again.
In addition, also existing accumulation duration is reset after having executed oil return operation.
After existing accumulation duration is reset, S10 is returned to step, continues that indoor unit unlatching quantity is detected and sentenced
It is disconnected.
Step S23, if so, continuing to add up the existing accumulation duration；
If so, i.e. indoor unit opens quantity less than or equal to first threshold, then continue to add up existing accumulation duration, correlation is retouched
The explanation seen above in relation to existing accumulation duration under step S22 is stated, is not repeated herein.
Step S24, judges whether the existing accumulation duration is greater than or equal to the first duration；
Step S25, if so, determining that the air conditioner has oil starvation risk.
If so, most oil enters oil circuit in compressor when i.e. existing accumulation duration is greater than or equal to the first duration
In pipeline, and because flow velocity is insufficient, may much oil can not all it be returned in compressor in oil line pipe, at this point it is possible to determine institute
Stating air conditioner has oil starvation risk；
Conversely, possible compressor is interior, and there are also enough oil, temporary and intact if existing accumulation duration is less than the first duration
Alopecia areata danger, then determine that air conditioner is unsatisfactory for oil return Rule of judgment.
Optionally, first threshold is the 50% of indoor unit total quantity, and first when is 1 hour a length of.
Open whether quantity is less than or equal to first threshold by judging the indoor unit, machine is opened quantity and is greater than indoors
When first threshold, existing accumulation duration is reset, returns and executes the step that indoor unit in the detection air conditioner opens quantity
Suddenly, it can avoid after opening quantity greater than state operation a period of time of first threshold with indoor unit in air conditioner, air conditioner compression
Machine is not in the state of oil starvation, because existing accumulation duration is not reset, opens quantity in air conditioner with indoor unit and is less than or equal to the
The state operation short period of one threshold value just meets oil return Rule of judgment, avoids carrying out useless oil return execution opportunity judgement
(i.e., if meet the judgement of oil return condition) reduces energy waste, obtains more accurate oil return and judge opportunity；If indoor unit is opened
Quantity is opened less than or equal to first threshold, then continues to add up the existing accumulation duration, whether judges the existing accumulation duration
Determine that the air conditioner has oil starvation wind if existing accumulation duration is greater than or equal to the first duration more than or equal to the first duration
Danger, that is, after air conditioner opens quantity less than or equal to state operation a period of time of first threshold with indoor unit, then judge sky
Adjust whether device meets oil return condition, it may be determined that more appropriate oil return judges opportunity, reduces useless judgement, reduces energy waste.
In the method for controlling oil return of multi-gang air-conditioner device of the present invention, three oil return conditions are proposed:
First condition: delivery temperature is greater than or equal to the first temperature threshold, and discharge superheat is greater than or equal to the second temperature
Spend threshold value；
Second condition: bottom oil temperature is greater than or equal to third temperature threshold, and the bottom oil temperature is more than or equal to described
Delivery temperature；
Third condition: delivery temperature is greater than or equal to the 4th temperature threshold, running frequency is less than or equal to first frequency value,
And running current is greater than or equal to the first current value.
Optionally, the first temperature threshold is 95 DEG C, and second temperature threshold value is 45 DEG C, first threshold 50%.At this point, when sky
It adjusts device to be in indoor unit and opens quantity less than or equal in the state of first threshold (taking 50%), compressor accumulates operation duration and is
When more than or equal to the first duration (taking 1 hour), the delivery temperature of compressor continues >=95 DEG C, that is, saturation pressure and condensation occurs
Temperature substantial deviation, under normal circumstances, if then delivery temperature should be 70~80 such as load 50% under 35 DEG C of cooling conditions of national standard
Within the scope of DEG C, discharge superheat is in 25~35 DEG C of ranges, and when delivery temperature raising extremely, and condensation temperature does not increase, and illustrates to press
There is oil starvation inordinate wear in contracting machine.
Optionally, third temperature threshold is 90 DEG C, wherein cooling compressor is to reduce temperature by bottom oil sump refrigeration oil
Degree, oil starvation situation lower bottom part oil temperature need to be 10 DEG C lower than delivery temperature or more for compressor, and when bottom oil temperature >=90 DEG C, and bottom is oily
When temperature is greater than compressor exhaust temperature, illustrate that compressing motor spindle lacks refrigeration oil.
Optionally, the 4th temperature threshold is 95 DEG C, and first frequency value is 50hz, the first current value ratio compressor protection frequency limit
The small 0.1A of current value, wherein under normal circumstances, when compressor exhaust temperature >=95 DEG C, compressor frequency≤50hz, compressor
Electric current should be 0.5A or 0.5A or more smaller than compressor protection frequency limit current value, and compressor current only compares compressor protection at this time
The small 0.1A of frequency limit current value illustrates that oil starvation abrasion occurs in compressor, and current anomaly increases.
Optionally, such as Fig. 3, in the method for controlling oil return 3rd embodiment of multi-gang air-conditioner device of the present invention, the step
Judge whether the air conditioner meets oil return condition described in S30, and when the air conditioner meets oil return condition, executes oil return
The step of operation includes:
Step S31 obtains the correspondence parameter that compressor is had turned in the air conditioner；
When air conditioner meets oil return Rule of judgment, all correspondence parameters for having turned on compressor in air conditioner, institute are acquired
It is any one in compressor exhaust temperature, discharge superheat, bottom oil temperature, running frequency and running current for stating corresponding parameter
It is a or multiple.Above-mentioned corresponding parameter can be obtained by the temperature sensing package and electric-controlled box that each compressor is arranged in.
Step S32 is judged in the air conditioner based on the correspondence parameter for having turned on compressor with the presence or absence of meeting the
One trigger condition has turned on compressor；
Based on each correspondence parameter for having turned on compressor, judge whether each compressor meets the first triggering item respectively
Part in one embodiment, if all compressors that have turned on all are unsatisfactory for the first trigger condition, determines that air conditioner is unsatisfactory for oil return
Condition does not execute oil return operation, returns and continue to execute step S31, in another embodiment, if all have turned on compressor not
Meet the first trigger condition, then continues judgement and have turned on whether compressor meets other trigger conditions.
Step S33 executes oil return behaviour if having turned on compressor in the presence of the first trigger condition of satisfaction in the air conditioner
Make, wherein the first trigger condition, for any one in the first condition, second condition, third condition.
As long as having turned on compressor there are at least one the first trigger condition of satisfaction in air conditioner, decide that air conditioner is full
Sufficient oil return condition is carried out oil return operation.The relevant explanation under step S30 is shown in related oil return operation, does not repeat herein.
By judge in air conditioner with the presence or absence of at least one compressor meet the first trigger condition, if it exists at least one
Compressor meet the first trigger condition, then execute oil return operation, wherein the first trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, as Fig. 3, step S32 include: later
Step S34 is based on if there is no meet first trigger condition to have turned on compressor in the air conditioner
The correspondence parameter for having turned on compressor judges to have turned on pressure with the presence or absence of the second trigger condition of satisfaction in the air conditioner
Contracting machine, wherein second trigger condition is any one in first condition, second condition and third condition, and described
Second trigger condition and first trigger condition be not identical；
If having turned on compressor there is no the first trigger condition of satisfaction in air conditioner, continue to be based on respectively having turned on compression
The correspondence parameter judgement of machine respectively has turned on compressor and whether meets the second trigger condition, in an embodiment, if all have turned on
Compressor is all unsatisfactory for the second trigger condition, then determines that air conditioner is unsatisfactory for oil return condition, does not execute oil return operation, returns and continue
Step S31 is executed, in another embodiment, if all compressors that have turned on all are unsatisfactory for the second trigger condition, continues to judge
Have turned on whether compressor meets other trigger conditions.
Optionally, the second trigger condition is also the first condition, second condition, any one in third condition, but
It is that the second trigger condition and the first trigger condition are different condition, for example, if when the first trigger condition is first condition,
Then the second trigger condition is second condition, any one in third condition, if the first trigger condition is second condition, the second touching
Clockwork spring part is first condition, any one in third condition, if the first trigger condition is third condition, the second trigger condition is
Any one in first condition, second condition.
Step S35 executes oil return behaviour if having turned on compressor in the presence of the second trigger condition of satisfaction in the air conditioner
Make.
If there is the second trigger condition of satisfaction in air conditioner has turned on compressor, oil return operation, related oil return are executed
The relevant explanation that step S30 is seen below is shown in operation, does not repeat herein.
By judge in air conditioner with the presence or absence of at least one compressor meet the second trigger condition, if it exists at least one
Compressor meet the second trigger condition, then execute oil return operation, wherein the second trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, as Fig. 3, step S34 include: later
Step S36 is based on if there is no meet second trigger condition to have turned on compressor in the air conditioner
The correspondence parameter for having turned on compressor judges to have turned on pressure with the presence or absence of meet third trigger condition in the air conditioner
Contracting machine, wherein the third trigger condition is any one in first condition, second condition and third condition, and described
Third trigger condition is different from first trigger condition, first trigger condition；
If having turned on compressor there is no the second trigger condition of satisfaction in air conditioner, continue to be based on respectively having turned on compression
The correspondence parameter judgement of machine respectively has turned on compressor and whether meets third trigger condition, in an embodiment, if all have turned on
Compressor is all unsatisfactory for third trigger condition, then determines that air conditioner is unsatisfactory for oil return condition, does not execute oil return operation, returns and continue
Execute step S31.
Optionally, third trigger condition is also the first condition, second condition, any one in third condition, but
It is that third trigger condition and the first trigger condition, the second trigger condition are different condition, for example, if the first trigger condition
It is second condition for first condition, the second trigger condition, then third trigger condition is third condition, if the first trigger condition is the
Two conditions, the second trigger condition are third condition, then third trigger condition is first condition, if the first trigger condition is first
Part, the second trigger condition are third condition, then third trigger condition is second condition.
Step S37, if exist in the air conditioner meet third trigger condition have turned on compressor, execute oil return behaviour
Make.
If exist in air conditioner meet third trigger condition have turned on compressor, execute oil return operation, related oil return
The relevant explanation that step S30 is seen below is shown in operation, does not repeat herein.
By judging to meet third trigger condition with the presence or absence of at least one compressor in air conditioner, if it exists at least one
Compressor meets third trigger condition, then execute oil return operation, wherein third trigger condition be based on compressor exhaust temperature,
The condition of multiple parameters composition in discharge superheat, bottom oil temperature, running frequency and running current is, it can be achieved that be based on air-conditioning
The virtual condition parameter of compressor in device is made whether to execute the judgement of oil return operation, and then realizes and be based on the practical shape of compressor
The not timing oil return of state can carry out oil return when more suitable, obtain better oil return effect.
Optionally, in an embodiment, first preset duration is 4s, the second preset duration 3s.
By description hereinbefore it is found that the first trigger condition, the second trigger condition and third trigger condition are different,
And first trigger condition, the second trigger condition and third trigger condition are first condition, second condition and third condition
In any one.
By using compressor exhaust temperature, discharge superheat, bottom oil temperature, running frequency and running current as first
The composition condition of trigger condition, the second trigger condition and third trigger condition, can real-time monitoring system operating status carry out
Not timing oil return control, it is contemplated that the oil starvation form of expression in a variety of situations, and then ensure compressor oil mass in several cases
Normally, to extend compressor service life.
Optionally, such as Fig. 4, in the method for controlling oil return fourth embodiment of multi-gang air-conditioner device of the present invention, the execution
After the step of oil return operates:
Step S38, what judgement met trigger condition has turned on whether compressor meets exit criteria；
Step S39, if so, exiting oil return operation.
Have turned on compressor for meet trigger condition, be determined as the compressor of oil starvation, need to be implemented oil return operation allow it is scarce
The compressor not oil starvation of oil.
Trigger condition specifically includes the first trigger condition, the second trigger condition and third trigger condition, meets the touching
The compressor that has turned on of clockwork spring part refers to and meets in first trigger condition, the second trigger condition and third trigger condition at least
One trigger condition has turned on compressor, that is, for arbitrarily having turned on compressor, as long as it meets above three triggering item
At least one of part, then determine that it is meet trigger condition have turned on compressor.
Judging each to have turned on whether compressor meets triggering respectively based on each correspondence parameter for having turned on compressor
When condition, the compressor that has turned on for meeting trigger condition is recorded, parameter acquisition object is used as subsequent, is being
When the no judgement for terminating oil return operation, acquisition meets the correspondence parameter for having turned on compressor of trigger condition, and based on its correspondence
Parameter judges whether it meets exit criteria, if satisfied, oil return operation is then exited, if conditions are not met, can then continue to execute oil return
Operation is until meet exit criteria, or can also move back when the execution duration that oil return operates is greater than or equal to the first preset duration
Oil return operates out, and operating execution overlong time to avoid oil return leads to the normal function for influencing air conditioner.
By meeting when having turned on compressor and meeting exit criteria of trigger condition, oil return operation is exited, it is ensured that should
Compressor is normal through oil return operation recovery, guarantees the realization of oil return effect.
Optionally, described to judge to meet the having turned in the step of whether compressor meets exit criteria of trigger condition, institute
It states exit criteria and is determined according to the trigger condition that compressor is met is had turned on, wherein is described to have turned on what compressor was met
When trigger condition is first condition, the exit criteria is less than or equal to the 5th temperature threshold for the delivery temperature, and described
Discharge superheat is less than or equal to the 6th temperature threshold；Optionally, the 5th temperature threshold is 80 DEG C, and the 6th temperature threshold is 20
℃。
Described when to have turned on trigger condition that compressor is met be second condition, the exit criteria is the bottom oil
Temperature is less than the 7th temperature threshold, and the bottom oil temperature is less than the delivery temperature；Optionally, the 7th temperature threshold is 70 DEG C,
And -5 DEG C of compressor exhaust temperature of oil temperature temperature <.
Described when to have turned on trigger condition that compressor is met be third condition, the exit criteria is that the exhaust is warm
Degree is less than the 8th temperature threshold, and the running frequency is greater than second frequency value, and the running current is less than the second current value.It can
Selection of land, the 8th temperature threshold are 90 DEG C, and second frequency value is 80hz, and the second current value h meets following formula:
H=i-m, (0.9A≤m≤1.1A)
Wherein, i is preset compressor protection current value, and m preferred value is 1A.
By the way that each trigger condition and each exit criteria are mapped, it can be ensured that the accuracy of entire oil return logic, it is ensured that
Oil return process is not influenced by other termination conditions, so that the compressor of oil starvation is restored to not oil starvation state, guarantees oil return effect
It realizes.
Optionally, it because executing oil return operation from the beginning, is carried out and described judges that meet trigger condition has turned on pressure
The step of whether contracting machine meets exit criteria, can may all obtain whithin a period of time be unsatisfactory for exit criteria as a result, therefore,
To reduce unnecessary termination condition judgement operation, energy consumption is reduced, when executing oil return operation, statistics oil return operation is held
The row time starts to execute the judgement when detecting that oil return operation continuously carries out duration more than or equal to the second preset duration
Meet trigger condition has turned on the step of whether compressor meets exit criteria.
Optionally, first temperature threshold in first condition is 90 DEG C~97 DEG C.By the way that the first temperature threshold is arranged,
The conditioners running conditions parameters such as the delivery temperature based on compressor can be achieved, accurate judgement is carried out to oil starvation compressor, and then really
Fixed accurate oil return operates opportunity.
Optionally, the first current value I in third condition meets following formula:
I=i-k, (0.05A≤k≤0.15A)
Wherein, i is preset compressor protection current value.
By the first current value of setting, it can be achieved that being compressed based on conditioners running conditions parameters such as compressor currents to oil starvation
Machine carries out accurate judgement, and then determines that accurate oil return operates opportunity.
Optionally, such as Fig. 5, in the 5th embodiment of method for controlling oil return of multi-gang air-conditioner device of the present invention, the step
Include: after S30
Step S40 counts the operation duration of the oil return operation；Step S50, in the operation for detecting the oil return operation
When duration is greater than or equal to the second duration, oil return operation is exited.
When executing oil return operation, the operation duration of statistics oil return operation is big in the operation duration for detecting oil return operation
When the second duration, oil return operation is exited, to avoid the too long normal operation for influencing air-conditioning of oil return operation runing time.
Optionally, second when it is 3.5-5 minutes a length of, can specifically choose 4 minutes be used as the second duration.
Limit value is set by the operation duration operated to oil return, the operation duration that can avoid oil return operation is too long, avoids
Adverse effect is caused to the normal operation of air-conditioning.
The present invention also proposes a kind of oil return control device, such as Fig. 6, comprising:
Detection unit 101, the detection unit open quantity for detecting indoor unit in the air conditioner；
Judging unit 102, the judging unit are used to open whether quantity judges the air conditioner based on the indoor unit
There is oil starvation risk；
Oil return unit 103, the oil return unit are used for when the air conditioner meets oil return Rule of judgment, judge the sky
It adjusts whether device meets oil return condition, and when the air conditioner meets oil return condition, executes oil return operation.
The present invention also proposes a kind of air conditioner, such as Fig. 7, comprising:
It is stored with the computer readable storage medium 201 and processor 202 of computer program, the computer program is by institute
When stating the reading of processor 202 and running, the method for controlling oil return such as above-mentioned multi-gang air-conditioner device is realized.
The present invention also proposes a kind of computer readable storage medium, which is characterized in that the computer readable storage medium
It is stored with computer program, when the computer program is read out by the processor and runs, is realized such as above-mentioned multi-gang air-conditioner device
Method for controlling oil return.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (14)
1. a kind of method for controlling oil return of multi-gang air-conditioner device characterized by comprising
It detects indoor unit in the air conditioner and opens quantity；
Quantity, which is opened, based on the indoor unit judges whether the air conditioner has oil starvation risk；
If so, judging whether the air conditioner meets oil return condition, and when the air conditioner meets oil return condition, execute back
Oil operation.
2. the method for controlling oil return of multi-gang air-conditioner device as described in claim 1, which is characterized in that described to be based on the indoor unit
It opens quantity and judges that the step of whether air conditioner has oil starvation risk includes:
Judge that the indoor unit opens whether quantity is less than or equal to first threshold；
If it is not, then resetting existing accumulation duration, returns and execute the step that indoor unit in the detection air conditioner opens quantity
Suddenly, wherein when the existing accumulation under a length of current time, the indoor unit opens quantity and is less than or equal to the tired of first threshold
Plot operation duration；
If so, continuing to add up the existing accumulation duration；
Judge whether the existing accumulation duration is greater than or equal to the first duration；
If so, determining that the air conditioner has oil starvation risk.
3. the method for controlling oil return of multi-gang air-conditioner device as described in claim 1, which is characterized in that the judgement air conditioner
Whether oil return condition is met, and when the air conditioner meets oil return condition, executing the step of oil return operates includes:
Obtain the correspondence parameter that compressor is had turned in the air conditioner；
Based on the correspondence parameter for having turned on compressor, judge in the air conditioner with the presence or absence of the first trigger condition of satisfaction
Have turned on compressor；
If there is the first trigger condition of satisfaction in the air conditioner has turned on compressor, oil return operation is executed, wherein described
First trigger condition is any one in first condition, second condition and third condition,
The first condition is that delivery temperature is greater than or equal to the first temperature threshold, and discharge superheat is greater than or equal to the second temperature
Threshold value is spent, the second condition is that bottom oil temperature is greater than or equal to third temperature threshold, and the bottom oil temperature is greater than or equal to
The delivery temperature, the third condition are that delivery temperature is greater than or equal to the 4th temperature threshold, running frequency is less than or equal to
First frequency value, and running current is greater than or equal to the first current value.
4. the method for controlling oil return of multi-gang air-conditioner device as claimed in claim 3, which is characterized in that described to be had turned on based on described
The correspondence parameter of compressor judges in the air conditioner with the presence or absence of the step of having turned on compressor of the first trigger condition of satisfaction
Include: later
If there is no meet first trigger condition to have turned on compressor in the air conditioner, pressure is had turned on based on described
The correspondence parameter of contracting machine judges to have turned on compressor with the presence or absence of the second trigger condition of satisfaction in the air conditioner, wherein institute
The second trigger condition is stated as any one in first condition, second condition and third condition, and second trigger condition
It is not identical as first trigger condition；
If there is the second trigger condition of satisfaction in the air conditioner has turned on compressor, oil return operation is executed.
5. the method for controlling oil return of multi-gang air-conditioner device as claimed in claim 4, which is characterized in that if in the air conditioner
There is no meet first trigger condition to have turned on compressor, then based on the correspondence parameter for having turned on compressor, sentences
Break in the air conditioner with the presence or absence of meet the second trigger condition the step of having turned on compressor after include:
If there is no meet second trigger condition to have turned on compressor in the air conditioner, pressure is had turned on based on described
The correspondence parameter of contracting machine judges to have turned on compressor with the presence or absence of meet third trigger condition in the air conditioner, wherein institute
Third trigger condition is stated as any one in first condition, second condition and third condition, and the third trigger condition
It is different from first trigger condition, first trigger condition；
If exist in the air conditioner meet third trigger condition have turned on compressor, execute oil return operation.
6. the method for controlling oil return of multi-gang air-conditioner device as described in any one of claim 3 to 5, which is characterized in that described to hold
After the step of row oil return operates:
What judgement met trigger condition has turned on whether compressor meets exit criteria；
If so, exiting oil return operation.
7. the method for controlling oil return of multi-gang air-conditioner device as claimed in claim 6, which is characterized in that the judgement meets triggering item
Part had turned in the step of whether compressor meets exit criteria, and the exit criteria is according to having turned on what compressor was met
Trigger condition determines, wherein described when to have turned on trigger condition that compressor is met be first condition, the exit criteria is
The delivery temperature is less than or equal to the 5th temperature threshold, and the discharge superheat is less than or equal to the 6th temperature threshold；
Described when to have turned on trigger condition that compressor is met be second condition, the exit criteria is that the bottom oil temperature is small
In the 7th temperature threshold, and the bottom oil temperature is less than the delivery temperature；
Described when to have turned on trigger condition that compressor is met be third condition, the exit criteria is that the delivery temperature is small
In the 8th temperature threshold, and the running frequency is greater than second frequency value, and the running current is less than the second current value.
8. the method for controlling oil return of multi-gang air-conditioner device as claimed in claim 1 or 2, which is characterized in that the judgement sky
Include: after the step of adjusting whether device meets oil return condition, and when the air conditioner meets oil return condition, executing oil return operation
Count the operation duration of the oil return operation；
When detecting that the operation duration of the oil return operation is greater than or equal to the second duration, oil return operation is exited.
9. the method for controlling oil return of multi-gang air-conditioner device as claimed in claim 2, which is characterized in that the first threshold is interior
The 50% of machine total quantity.
10. the method for controlling oil return of multi-gang air-conditioner device as described in any one of claim 3 to 5, which is characterized in that described
One temperature threshold is 90 DEG C~97 DEG C.
11. the method for controlling oil return of multi-gang air-conditioner device as described in any one of claim 3 to 5, which is characterized in that described
One current value I meets following formula:
I=i-k, (0.05A≤k≤0.15A)
Wherein, i is preset compressor protection current value.
12. a kind of oil return control device characterized by comprising
Detection unit, the detection unit open quantity for detecting indoor unit in the air conditioner；
Judging unit, the judging unit, which is used to open quantity based on the indoor unit, judges whether the air conditioner has oil starvation wind
Danger；
Oil return unit, the oil return unit are used for when the air conditioner meets oil return Rule of judgment, judge that the air conditioner is
It is no to meet oil return condition, and when the air conditioner meets oil return condition, execute oil return operation.
13. a kind of air conditioner, which is characterized in that computer readable storage medium and processing including being stored with computer program
Device when the computer program is read and run by the processor, realizes such as the described in any item methods of claim 1-11.
14. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer journey
Sequence when the computer program is read out by the processor and runs, realizes such as the described in any item methods of claim 1-11.
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| CN201910597539.2A CN110296546B (en) | 2019-07-04 | 2019-07-04 | Oil return control method and oil return control device of multi-split air conditioner and air conditioner |
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| CN111426011A (en) * | 2020-04-13 | 2020-07-17 | 广东美的暖通设备有限公司 | Control method of air conditioning system, air conditioning system and computer storage medium |
| CN111503851A (en) * | 2020-04-29 | 2020-08-07 | 广东美的暖通设备有限公司 | Control method and device of multi-split air conditioning system |
| CN111623559A (en) * | 2020-06-08 | 2020-09-04 | 珠海拓芯科技有限公司 | Oil return control method and air conditioner |
| CN112032827A (en) * | 2020-08-28 | 2020-12-04 | 青岛海尔空调电子有限公司 | Oil return control method of multi-split air conditioning system |
| CN112361538A (en) * | 2020-11-25 | 2021-02-12 | 珠海格力电器股份有限公司 | Oil return control method and device and multi-split system |
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| CN114543255A (en) * | 2021-12-24 | 2022-05-27 | 青岛海尔空调电子有限公司 | Oil return control method and device, multi-split air conditioning system and storage medium |
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